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40 lines
894 B
C
40 lines
894 B
C
// SPDX-License-Identifier: GPL-3.0-or-later
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// Copyright (C) 2016 Andrea Mazzoleni
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#ifndef __BW_H
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#define __BW_H
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#include "state.h"
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#include "support.h"
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/**
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* Bandwidth limiting
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*/
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struct snapraid_bw {
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uint64_t limit; /**< Bandwidth limit in bytes per second */
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uint64_t total; /**< Remaining bytes allowed in current second */
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uint64_t start; /**< Time when to reset the bandwidth counter */
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#if HAVE_THREAD
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thread_mutex_t lock; /**< Mutex protecting bw fields */
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#endif
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};
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/**
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* Initialize the bandwidth limit
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*/
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void bw_init(struct snapraid_bw* bw, uint64_t limit);
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/**
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* Destroy the bandwidth limit
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*/
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void bw_done(struct snapraid_bw* bw);
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/**
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* Limit IO bandwidth to stay within the configured limit.
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* If no limit is set, returns immediately.
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* Otherwise sleeps as needed to maintain the rate limit.
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*/
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void bw_limit(struct snapraid_bw* bw, uint64_t bytes);
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#endif
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